+ return RecurseNavigationNode(template_nodes, instance_var, key)
+
+
+@register.filter
+def has_navigation(node, key=None):
+ try:
+ nav = node.navigation
+ if key is not None:
+ if key in nav and bool(node.navigation[key]):
+ return True
+ elif key not in node.navigation:
+ return False
+ return bool(node.navigation)
+ except:
+ return False